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Pages 29-33

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From page 29...
... 29 C H A P T E R 4 Survey invitations were sent to all addresses obtained from DirectMail within the defined study areas. Respondents were assigned one of four versions that presented a different series of six roadway images.
From page 30...
... 30 Bicyclist Facility Preferences and Effects on Increasing Bicycle Trips Area Households Contacted Responses Response Rate Anniston 4,348 198 4.6% Opelika 3,362 185 5.5% Chattanooga 4,400 239 5.4% Talladega 3,305 93 2.8% Northport 3,708 234 6.3% Birmingham 4,294 274 6.4% Total 23,417 1,223 5.2% Note: Anniston, Opelika, and Chattanooga are treatment locations with planned bicycle facility improvements. Table 4.1.
From page 31...
... Description of Survey Respondents 31 ability of the study to describe the preferences of the population as a whole, but not necessarily to explain the relationships between variables. Including sociodemographics in models is a time-honored way of controlling for nonresponse bias.
From page 32...
... 32 Bicyclist Facility Preferences and Effects on Increasing Bicycle Trips Wave 2 Respondents Invitations for the second-wave survey were sent to all those who responded to the first-wave invitation. The second-wave survey had just under a 50% response rate, as shown in Table 4.5.
From page 33...
... Description of Survey Respondents 33 A smaller portion of respondents in the lowest income group responded to Wave 2 than to Wave 1, indicating continuation of a response bias against this lowest income group. The distribution of response rates among households of different sizes was somewhat stable between waves.

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